.highlight-container {
  position: relative;
}
.highlight-container:hover .copy-btn,
.highlight-container .copy-btn:focus {
  opacity: 1;
}
.copy-btn {
  color: var(--default-text-color);
  cursor: pointer;
  display: inline-block;
  font-weight: bold;
  line-height: 1.8;
  opacity: 0;
  outline: 0;
  padding: 2px 6px;
  position: absolute;
  vertical-align: middle;
  white-space: nowrap;
  font-size: 1rem;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  background: var(--background-color);
  border: 0;
  right: 0;
  top: 0;
}
